Energy and Waves

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Across
  1. 1. Two waves with matching crests and troughs.
  2. 3. A liquid or a gas.
  3. 7. A signal or wave that varies continuously.
  4. 8. Infra-red and visible light are ***** inside an optical fibre.
  5. 9. Prefix for a thousand.
  6. 10. This type of signal is a series of pulses.
  7. 12. The unit of energy.
  8. 13. Heat transfer through particles in contact.
  9. 15. These materials are good conductors of heat.
  10. 19. The unit of frequency, vibrations per second.
  11. 20. Heat transfer by infra-red waves.
  12. 21. What we call poor conductors.
  13. 23. **** frequency = short wavelength and high energy.
  14. 25. The ratio of useful energy to total input energy.
  15. 27. What waves transfer from one place to another.
  16. 30. Radio, gamma and infra-red are 3 types of ******* waves.
  17. 32. Infra-red and light can be transmitted down these fibres.
  18. 34. Prefix for a million.
  19. 36. Energy of moving electrons.
  20. 37. Energy which is not useful.
  21. 38. The longest e-m waves, used for communication.
  22. 40. To give out radiation.
  23. 41. A intense, coherent beam of light.
  24. 42. For a wave, equals frequency x wavelength.
Down
  1. 1. Given out by all objects, but much more by hot objects.
  2. 2. Shiny, metallic surfaces do this well with IR radiation.
  3. 4. The part of the e-m spectrum our eyes can detect.
  4. 5. Unit of temperature.
  5. 6. Change in the direction of a wave when passing from one medium to another.
  6. 9. Infrared and microwaves increase the **** energy of the particles in food.
  7. 11. A measure of 'hotness'.
  8. 14. Digital signals suffer less of this.
  9. 16. The time it takes for an energy saving improvement to pay for itself.
  10. 17. The number of waves per second.
  11. 18. The highest energy group of e-m waves.
  12. 19. A measure of the total internal energy of an object.
  13. 22. Meaning related to heat.
  14. 24. The distance between peak and the next.
  15. 26. Group of e-m waves responsible for sunburn.
  16. 28. Distance between the resting position of a wave and its crest.
  17. 29. Bending of waves at an opening.
  18. 31. Heat transfer in fluids due to less dense material rising.
  19. 33. Black, dull surfaces do this well with IR radiation.
  20. 35. Used for heating food and sending information to satellites.
  21. 37. Microwaves are absorbed by **** particles in food.
  22. 39. The second highest frequency group of e-m waves.